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Up for sale is an Audio Research SP-6E tube preamplifier with moving magnet phono stage. It has enough gain to accommodate a medium output moving coil cartridge without the need of a step up transformer or pre-preamplifier.

The E version is the last and the best version of the SP-6 family before the introduction of the SP-8. It is seldom available on the used market.

Preamplifier has been extremely well taken care of, in excellent to near mint cosmetic condition and perfect working order.

Input impedance:50k Ohms, all inputs. (Magnetic phono may have any value from 10 ohms to 100k Ohms substituted. Also has provision to add to the 40pf input capacitance for matching certain magnetic cartridges.)

Power supplies:Electronically-regulated solid-state supplies. Frequency-compensated high voltage supplies have a total equivalent low frequency stability of greater than 1 farads of capacitance. Line regulation better than .001%.